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MORTGAGE LOAN RECEIVABLES - Activity in Loan Portfolio (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Activity in loan portfolio    
Balance at the beginning of the period, provision for loan losses $ (4,000)  
Realized (gain) loss on sale of mortgage loan receivables held for sale (4,888) $ 999
Loan loss provision (3,000) 0
Balance at the end of the period, provision for loan losses [1] (7,000)  
Loans held for sale transferred loan held for investment, book value 57,600 120,000
Loans held for sale transferred to loans held for investments, fair value $ 55,400 $ 119,900
Loans from held for sale transferred to portfolio loans, remaining maturity 2 years 6 months 7 days 3 years
Mortgage loans held by consolidated subsidiaries    
Activity in loan portfolio    
Balance at the beginning of the period $ 3,282,462 $ 2,000,095
Origination of mortgage loan receivables 434,632 249,829
Purchases of mortgage loan receivables 0  
Repayment of mortgage loan receivables (249,106) (68,251)
Realized (gain) loss on sale of mortgage loan receivables held for sale 0 0
Proceeds from sales of mortgage loan receivables 0  
Transfer between held for investment and held for sale 55,403 119,952
Accretion/amortization of discount, premium and other fees 4,794 2,468
Loan loss provision 0  
Balance at the end of the period 3,528,185 2,304,093
Mortgage loan receivables held for investment, net, at amortized cost    
Activity in loan portfolio    
Balance at the beginning of the period, provision for loan losses (4,000) (4,000)
Transfer Of Loans Held For Sale To (From) Portfolio Loans   0
Loan loss provision (3,000)  
Balance at the end of the period, provision for loan losses (7,000) (4,000)
Mortgage loan receivables held for sale    
Activity in loan portfolio    
Balance at the beginning of the period 230,180 357,882
Origination of mortgage loan receivables 532,878 279,898
Purchases of mortgage loan receivables 0  
Repayment of mortgage loan receivables (133) (247)
Realized (gain) loss on sale of mortgage loan receivables held for sale (4,888) 999
Proceeds from sales of mortgage loan receivables (438,774)  
Transfer between held for investment and held for sale (55,403) (119,952)
Accretion/amortization of discount, premium and other fees 0 0
Loan loss provision 0  
Balance at the end of the period 273,636 516,582
Realized losses on loans recorded as other than temporary impairments $ 500 $ 1,000
[1] Includes amounts relating to consolidated variable interest entities. See Note 3.